Roller-mill.



'No. 796,507. PATENTED AUG. 8, 1905. W. D. GRAY.

ROLLER MILL.

APPLICATION FILED MAY 6, 1905.

66%. MW, ag mawzfx fim 1 Mam w! UNITED STATES WILLIAM D. GRAY, OF MILWAUKEE, WISCONSIN.

ROLLER-MILL.

Specification of Letters Patent.

Patented Aug. 8, 1905.

Application filed May 6, 1905. Serial No- 259,145.

To a whom, it may concern:

Be it known that I, WILLIAM D. GRAY, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Roller-Mills, of which the following is a specification, reference being had to the accompanying drawing, forming a part thereof.

This invention relates more particularly to adjustments for varying the distance of the rolls from each other and for varying the tension of the springs which hold the yielding rolls against the stationary rolls. Its objects are to facilitate such adjustments and generally to improve the construction and operation of machines of this class.

It consists in certain novel features of construction and in the peculiar arrangement and combinations of parts hereinafter particularly described and claimed. v

The accompanying drawing shows an end elevation of a part of a roller-mill to which the improvements embodying the present invention are applied.

a designates the main case or frame, and

Z) 5 parallel twin journal-boxes, which are immovably bolted to the frame for the journals at one end of the inner stationary rolls.

0 0 are swing-boxes pivoted at d cl to the frame below and parallel with their axes, which are also parallel with the axes of the boxes 6 Z). These swing-boxes are formed or provided with upwardly-extending arms 6 c, which terminate in internally-threaded sockets ff, whose axes are transverse to the axes of said boxes and are approximately in line with each other.

9 g are adjusting-screws centrally and axially threaded in the outer ends of the sockets f f. They are formed in their inner ends with central sockets, in which antifrictionballs h h are loosely held by perforated caps.

i 7, are cylindrical spring-cases externally threaded at their outer open ends to engage with the internal threads in the inner open ends of the sockets ff.

j is a rocker-shaft supported in bearings on the case or frame a above and between the twinboxes b 6. It is provided with two oppositely-directed eccentrics l2 and at one end with an operating lever or arm Z. Rods m m, having straps or eyes at their inner ends fitted upon the eccentrics 76, pass through openings in the inner ends of the spring-cases zl and are provided at their outer ends, which are formed with central depressed seats for and bear against the balls 7, with springseats a. Between these seats and washers 0, bearing against the inner ends of the cases c', are interposed spiral springs 39. which yieldingly hold the outer ends of the rods m against the ball h in the inner ends of the adjusting-screws g.

The spring-cases 2' are each formed with a circumferential series of holes q to receive a spanner-wrench for turning said cases in or out of the sockets f to adjust the tension of the springs p.

In starting a roller-mill of this kind the rolls are separated by throwing the leverl to the right, in which position it is shown in the drawing. This operates, through the eccentrics 7c and their connections, hereinbefore mentioned, to shift the swing-boxes 0 c and the outer movable rolls, which they carry, away from the twin boxes I) Z) and the inner stationary rolls which they carry, thus permitting the mechanism of the machine to be set in motion without resistance other than what is offered by the friction in the bearings of the various moving parts. When the machine is in motion, the lever Z is thrown back to the left, thereby simultaneously carrying the outer movable rollers into their working positions with relation to the inner stationary rollers. The grinding distance, or the distance of the outer movable rollers carried by the swing-boxes c from the inner stationary rollers carried by the boxes 6, is determined by the adjusting-screws 9. By turning these screws in the connections between the swingboxes and the rocker-shaft j will, in effect, be lengthened and the grinding distance will be correspondingly increased. By turning said screws out the grinding distance will in like manner be diminished. Any change in the adjustment of the screws Q will correspondingly change the tension of the associated springs 9, which may be adjusted to compensate for such change and to vary the pressure by which they hold the outer rolls to their work by screwing the spring-cases i into or out of the sockets f.

The adjusting-screws g, being of small pitch and having ball-bearings against the eccentricrods m, afford a fine sensitive adjustment, and

the spring-cases i serve not only to adjust the tension of the springs p, but also to protect them and the bearings between the screws g and rods m from flour and dust.

Various changes in minor details ofconstruction and in the arrangement of parts may be made without affecting the principle and intended scope of the invention.

I claim- 1. In a roller-mill the combination with a stationary journal-box, a parallel journal-box movable laterally toward and from the stationary box and a throw-out eccentric provided with a lever for turningit, of an adjusting-screw threaded in the movable box transversely to its axis, a spring-case also having athreaded connection with said box concentric with said screw, a rod connected at one end with said eccentric and provided at the other end which bears against the inner end of said screw, with a spring-seat, and a spring interposed between said seat and the inner end of the spring-case, substantially as described.

2. In a roller-mill the combination with a stationary journal-box, a parallel journal-box movable laterally toward and from the stationary box and a throw-out eccentric provided with an operating-arm, of an adj ustingscrew threaded in the movable box transversely to its axis and provided with a ball which is loosely held in a central socket in its inner end, a spring-case threaded in said box concentrically with said screw, a rod connected at one end with said eccentric and provided with a spring-seat at the other end, which bears centrally against said ball, and a spiral spring inclosed in said spring case around said rod and hearing at one end against said case and at the other end against the spring-seat on said rod, substantially as described.

3. In a roller-mill the combination with the main frame provided with a stationary journal-box, of a parallel journalbox pivoted at one side thereof and parallel with its axis to said frame and having on the opposite side and transverse to its axis an internally threaded socket, a spring case threaded at one end in said socket, an adjusting-screw centrally and axially threaded in said socket, a throw-out eccentric provided with an operating-arm and journaled in said frame parallel with said bearings, a rod connected at one end with said eccentric and provided at the other end with a spring-seat and a spiral spring inclosed in said case around said rod and bearing at one end against said seat and at the other end againstthe opposite end of said case, substantially as described.

4. In a roller-mill the combination with the main frame, provided with stationary twin journal-boxes, swing journal-boxes pivoted to said frame outside of and parallel with said stationary boxes toward and from which they are movable, adjusting-screws threaded in said swingboxes transversely to their axes, spring-cases threaded in said swing-boxes concentrically with said screws, a shaft journaled in said frame parallel with said boxes and provided with oppositely-directed eccentrics and with an operating-arm, rods connected at their inner ends with said eccentrics and provided with springseats at their outer ends which bear against the inner ends of said adjusting-screws, and springs inclosed in said cases around said rods and bearing at their outer ends against said seats and at their inner ends against the inner ends of said cases, substantially as described.

In witness whereof I hereto aflix my signature in presence of two witnesses.

WILLIAM D. GRAY.

Witnesses:

BERNARD C. RoLoFF, CHAs. L. Gross. 

